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In this optics activity, learners use paint thinner to make a small jar seem to disappear inside a larger jar.

This is a quick activity (on page 2 of the PDF under Stained Glass Activity) about the "Tyndall effect," the scattering of visible light when it hits very small dispersed particles.

In this activity, learners examine their tongue and taste buds.

In this optics activity, learners examine how a transparent material such as glass or water can actually reflect light better than any mirror.

In this four-part activity, learners explore light and sound through a variety of hands-on investigations.